Pontiac: Need help with cam choice

I don't think you could go too far wrong using the famous 068 cam (288/302
dur max torque @ 3000 rpm max hp @ 4600 rpm ) in any Pontiac engine. This
was the original tri-power cam from 1965 and was used in various Ram air/455
applications after that.

"unix-freak" <com> wrote in message
news:google.com... 

unix-freak wrote: 

You might look here: http://www.boyleworks.com/ta400/psp/camquickref.html

Another reference you might hit on Usenet is alt.autos.camaro.firebird

FBR wrote: 

Another good article that might help:
http://www.boyleworks.com/ta400/psp/camshaft.html

I think he could do better than a cam ground in 1965. I dont know cams
that well but I know they got better in designing them. If anything
hurts those 400 motors its the flow from the heads and that compression
ratio. 9.0:1 or 9.5:1 would greatly up things. A cam with more duration
can add to the actual compression.
Check out
www.northernautoparts.com
and see what they got. Right now its slow or not working for me...

In article <egVLb.481$cgocable.net>,
ca says... 

I would argue to the contrary, particularly if the heads are
marginal. A cam with too much duration (and typically a consequently tighter LDA)
tends to bleed off cylinder pressure at low rpm. Combine this with a low
static compression ratio (like 8.4) and the motor will have major trouble
getting the fuel vaporized at lower revs. The classic "solution" is to
richen up the idle/off idle to load the motor with fuel in the hopes of
getting enough vaporized to keep the engine running. This, however, will
wash down the cylinder walls, and before long, it's rebuild time.
Personally, I'd either kick that compression ratio up a full point, or
I'd forget 300hp and stick with a very conservative cam profile. If the
builder opts to stab in a wild cam nevertheless, I would strongly advise
to install it significantly advanced to help salvage a little low end
pressure.

Mark

On Sat, 10 Jan 2004 09:42:51 -0700, Bon·ne·ville wrote:
 

--
remove 'spamsucks' from mail addy for replies.
I fart in Darl McBride's general direction.
Be kind to animals--use proper seasonings.
Rust is good--it eliminates dents.

Yeah thats true. Like I said I dont know cams that well but I know a
sucky compression when I see one. Maybe after going to northern he may
budget in some new pistons.

In article <net>,
net says... 

In article <woh.rr.com>, sp@m.b.gone
says... 


You can't go wrong with the 068 RA/HO or RA-IV cams. They may be old but
they're tried and true. I yanked a CompCams Extreme cam out of my 455 HO that
the previous owner installed for a factory 068 cam. The car ran so much better
and had so much more power. The factory cams have a very nice lope to them
especially the RA-IV cam. None of the radical cams are going to work well with
8.4:1 compression.


--
__________________________________________________ _______________
Dennis Smith

-1971 Trans Am - 455 H.O. - M21 4speed - Cameo white/blue stripe-
< http://ps2page.tripod.com/my71ta/tapage.html >
-1973 Trans Am - 455 - TH400 auto - Buccaneer red-
-1984 Trans Am - 5.0 L - TH700R4 auto - Royal blue/silver aero-
__________________________________________________ _______________

This is why today's cams with faster acceleration rates will give you
the same .050 duration as the older cams with less overall duration.
What you ready need to calculate is what is call dynamic compression
ratio. If this is to low you not have much bottom end power if this is
to high you will not be able to run on pump gas.
Stan

Marky wrote: